Su·pine a.
  1. Lying on the back, or with the face upward; -- opposed to prone.
  2. Leaning backward, or inclining with exposure to the sun; sloping; inclined.
  If the vine
  On rising ground be placed, or hills supine.   --Dryden.
  3. Negligent; heedless; indolent; listless.
     He became pusillanimous and supine, and openly exposed to any temptation.   --Woodward.
  Syn: -- Negligent; heedless; indolent; thoughtless; inattentive; listless; careless; drowsy.
  -- Su*pine*ly, adv. -- Su*pine*ness, n.